add parser test with unexpectedly mixed connection map ordering
add parser test with unexpectedly mixed connection map ordering

cellml/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,MichaelClerx/libcellml,libcellml/buildbot-testing,MichaelClerx/libcellml,cellml/libcellml,libcellml/buildbot-testing,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml